Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments. Elementary instruction in practical mechanical drawing. Together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1889)
circle 60 degrees are marked. Thismay be explained further by stating that the pointo or zero may be situated at the point from which thedegrees of angle are to be taken. Here it may beremarked that, to save writing the word degrees,it is usual to place on the right and above the figuresa small °,… … Fig. 57- the other. Then, if we have a protractor, we mayapply it to the lines and see how many degrees ofangle they contain. This word contain means howmany degrees of angle there are between the lines, LINES AND CURVES. 55 which, in the absence of a protractor, we may find byprolonging the Hnes…
Mechanical drawing
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